2020-04-03 19:43:43 +00:00
|
|
|
package cobra
|
|
|
|
|
|
|
|
import (
|
|
|
|
"errors"
|
|
|
|
"fmt"
|
|
|
|
"os"
|
|
|
|
"strings"
|
|
|
|
|
|
|
|
"github.com/spf13/pflag"
|
|
|
|
)
|
|
|
|
|
2020-04-10 19:56:28 +00:00
|
|
|
const (
|
|
|
|
// ShellCompRequestCmd is the name of the hidden command that is used to request
|
|
|
|
// completion results from the program. It is used by the shell completion scripts.
|
|
|
|
ShellCompRequestCmd = "__complete"
|
|
|
|
// ShellCompNoDescRequestCmd is the name of the hidden command that is used to request
|
|
|
|
// completion results without their description. It is used by the shell completion scripts.
|
|
|
|
ShellCompNoDescRequestCmd = "__completeNoDesc"
|
|
|
|
)
|
2020-04-03 19:43:43 +00:00
|
|
|
|
|
|
|
// Global map of flag completion functions.
|
2020-04-06 17:28:44 +00:00
|
|
|
var flagCompletionFunctions = map[*pflag.Flag]func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective){}
|
2020-04-03 19:43:43 +00:00
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
// ShellCompDirective is a bit map representing the different behaviors the shell
|
2020-04-03 19:43:43 +00:00
|
|
|
// can be instructed to have once completions have been provided.
|
2020-04-06 17:28:44 +00:00
|
|
|
type ShellCompDirective int
|
2020-04-03 19:43:43 +00:00
|
|
|
|
|
|
|
const (
|
2020-04-06 17:28:44 +00:00
|
|
|
// ShellCompDirectiveError indicates an error occurred and completions should be ignored.
|
|
|
|
ShellCompDirectiveError ShellCompDirective = 1 << iota
|
2020-04-03 19:43:43 +00:00
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
// ShellCompDirectiveNoSpace indicates that the shell should not add a space
|
2020-04-03 19:43:43 +00:00
|
|
|
// after the completion even if there is a single completion provided.
|
2020-04-06 17:28:44 +00:00
|
|
|
ShellCompDirectiveNoSpace
|
2020-04-03 19:43:43 +00:00
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
// ShellCompDirectiveNoFileComp indicates that the shell should not provide
|
2020-04-03 19:43:43 +00:00
|
|
|
// file completion even when no completion is provided.
|
|
|
|
// This currently does not work for zsh or bash < 4
|
2020-04-06 17:28:44 +00:00
|
|
|
ShellCompDirectiveNoFileComp
|
2020-04-03 19:43:43 +00:00
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
// ShellCompDirectiveDefault indicates to let the shell perform its default
|
2020-04-03 19:43:43 +00:00
|
|
|
// behavior after completions have been provided.
|
2020-04-06 17:28:44 +00:00
|
|
|
ShellCompDirectiveDefault ShellCompDirective = 0
|
2020-04-03 19:43:43 +00:00
|
|
|
)
|
|
|
|
|
|
|
|
// RegisterFlagCompletionFunc should be called to register a function to provide completion for a flag.
|
2020-04-06 17:28:44 +00:00
|
|
|
func (c *Command) RegisterFlagCompletionFunc(flagName string, f func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)) error {
|
2020-04-03 19:43:43 +00:00
|
|
|
flag := c.Flag(flagName)
|
|
|
|
if flag == nil {
|
|
|
|
return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' does not exist", flagName)
|
|
|
|
}
|
|
|
|
if _, exists := flagCompletionFunctions[flag]; exists {
|
|
|
|
return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' already registered", flagName)
|
|
|
|
}
|
|
|
|
flagCompletionFunctions[flag] = f
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Returns a string listing the different directive enabled in the specified parameter
|
2020-04-06 17:28:44 +00:00
|
|
|
func (d ShellCompDirective) string() string {
|
2020-04-03 19:43:43 +00:00
|
|
|
var directives []string
|
2020-04-06 17:28:44 +00:00
|
|
|
if d&ShellCompDirectiveError != 0 {
|
|
|
|
directives = append(directives, "ShellCompDirectiveError")
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
2020-04-06 17:28:44 +00:00
|
|
|
if d&ShellCompDirectiveNoSpace != 0 {
|
|
|
|
directives = append(directives, "ShellCompDirectiveNoSpace")
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
2020-04-06 17:28:44 +00:00
|
|
|
if d&ShellCompDirectiveNoFileComp != 0 {
|
|
|
|
directives = append(directives, "ShellCompDirectiveNoFileComp")
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
if len(directives) == 0 {
|
2020-04-06 17:28:44 +00:00
|
|
|
directives = append(directives, "ShellCompDirectiveDefault")
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
if d > ShellCompDirectiveError+ShellCompDirectiveNoSpace+ShellCompDirectiveNoFileComp {
|
|
|
|
return fmt.Sprintf("ERROR: unexpected ShellCompDirective value: %d", d)
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
return strings.Join(directives, ", ")
|
|
|
|
}
|
|
|
|
|
|
|
|
// Adds a special hidden command that can be used to request custom completions.
|
|
|
|
func (c *Command) initCompleteCmd(args []string) {
|
|
|
|
completeCmd := &Command{
|
2020-04-06 17:28:44 +00:00
|
|
|
Use: fmt.Sprintf("%s [command-line]", ShellCompRequestCmd),
|
2020-04-10 19:56:28 +00:00
|
|
|
Aliases: []string{ShellCompNoDescRequestCmd},
|
2020-04-03 19:43:43 +00:00
|
|
|
DisableFlagsInUseLine: true,
|
|
|
|
Hidden: true,
|
|
|
|
DisableFlagParsing: true,
|
|
|
|
Args: MinimumNArgs(1),
|
|
|
|
Short: "Request shell completion choices for the specified command-line",
|
|
|
|
Long: fmt.Sprintf("%[2]s is a special command that is used by the shell completion logic\n%[1]s",
|
2020-04-06 17:28:44 +00:00
|
|
|
"to request completion choices for the specified command-line.", ShellCompRequestCmd),
|
2020-04-03 19:43:43 +00:00
|
|
|
Run: func(cmd *Command, args []string) {
|
|
|
|
finalCmd, completions, directive, err := cmd.getCompletions(args)
|
|
|
|
if err != nil {
|
|
|
|
CompErrorln(err.Error())
|
|
|
|
// Keep going for multiple reasons:
|
|
|
|
// 1- There could be some valid completions even though there was an error
|
|
|
|
// 2- Even without completions, we need to print the directive
|
|
|
|
}
|
|
|
|
|
2020-04-10 19:56:28 +00:00
|
|
|
noDescriptions := (cmd.CalledAs() == ShellCompNoDescRequestCmd)
|
2020-04-03 19:43:43 +00:00
|
|
|
for _, comp := range completions {
|
2020-04-10 19:56:28 +00:00
|
|
|
if noDescriptions {
|
|
|
|
// Remove any description that may be included following a tab character.
|
|
|
|
comp = strings.Split(comp, "\t")[0]
|
|
|
|
}
|
2020-04-03 19:43:43 +00:00
|
|
|
// Print each possible completion to stdout for the completion script to consume.
|
|
|
|
fmt.Fprintln(finalCmd.OutOrStdout(), comp)
|
|
|
|
}
|
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
if directive > ShellCompDirectiveError+ShellCompDirectiveNoSpace+ShellCompDirectiveNoFileComp {
|
|
|
|
directive = ShellCompDirectiveDefault
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// As the last printout, print the completion directive for the completion script to parse.
|
|
|
|
// The directive integer must be that last character following a single colon (:).
|
|
|
|
// The completion script expects :<directive>
|
|
|
|
fmt.Fprintf(finalCmd.OutOrStdout(), ":%d\n", directive)
|
|
|
|
|
|
|
|
// Print some helpful info to stderr for the user to understand.
|
|
|
|
// Output from stderr must be ignored by the completion script.
|
|
|
|
fmt.Fprintf(finalCmd.ErrOrStderr(), "Completion ended with directive: %s\n", directive.string())
|
|
|
|
},
|
|
|
|
}
|
|
|
|
c.AddCommand(completeCmd)
|
|
|
|
subCmd, _, err := c.Find(args)
|
2020-04-06 17:28:44 +00:00
|
|
|
if err != nil || subCmd.Name() != ShellCompRequestCmd {
|
2020-04-03 19:43:43 +00:00
|
|
|
// Only create this special command if it is actually being called.
|
|
|
|
// This reduces possible side-effects of creating such a command;
|
|
|
|
// for example, having this command would cause problems to a
|
|
|
|
// cobra program that only consists of the root command, since this
|
|
|
|
// command would cause the root command to suddenly have a subcommand.
|
|
|
|
c.RemoveCommand(completeCmd)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-04-06 17:28:44 +00:00
|
|
|
func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDirective, error) {
|
2020-04-03 19:43:43 +00:00
|
|
|
var completions []string
|
|
|
|
|
|
|
|
// The last argument, which is not completely typed by the user,
|
|
|
|
// should not be part of the list of arguments
|
|
|
|
toComplete := args[len(args)-1]
|
|
|
|
trimmedArgs := args[:len(args)-1]
|
|
|
|
|
|
|
|
// Find the real command for which completion must be performed
|
|
|
|
finalCmd, finalArgs, err := c.Root().Find(trimmedArgs)
|
|
|
|
if err != nil {
|
|
|
|
// Unable to find the real command. E.g., <program> someInvalidCmd <TAB>
|
2020-04-06 17:28:44 +00:00
|
|
|
return c, completions, ShellCompDirectiveDefault, fmt.Errorf("Unable to find a command for arguments: %v", trimmedArgs)
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
|
2020-04-10 19:56:28 +00:00
|
|
|
// When doing completion of a flag name, as soon as an argument starts with
|
|
|
|
// a '-' we know it is a flag. We cannot use isFlagArg() here as it requires
|
|
|
|
// the flag to be complete
|
|
|
|
if len(toComplete) > 0 && toComplete[0] == '-' && !strings.Contains(toComplete, "=") {
|
|
|
|
// We are completing a flag name
|
|
|
|
finalCmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
|
|
|
|
completions = append(completions, getFlagNameCompletions(flag, toComplete)...)
|
|
|
|
})
|
|
|
|
finalCmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) {
|
|
|
|
completions = append(completions, getFlagNameCompletions(flag, toComplete)...)
|
|
|
|
})
|
|
|
|
|
|
|
|
directive := ShellCompDirectiveDefault
|
|
|
|
if len(completions) > 0 {
|
|
|
|
if strings.HasSuffix(completions[0], "=") {
|
|
|
|
directive = ShellCompDirectiveNoSpace
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return finalCmd, completions, directive, nil
|
|
|
|
}
|
|
|
|
|
2020-04-03 19:43:43 +00:00
|
|
|
var flag *pflag.Flag
|
|
|
|
if !finalCmd.DisableFlagParsing {
|
|
|
|
// We only do flag completion if we are allowed to parse flags
|
|
|
|
// This is important for commands which have requested to do their own flag completion.
|
|
|
|
flag, finalArgs, toComplete, err = checkIfFlagCompletion(finalCmd, finalArgs, toComplete)
|
|
|
|
if err != nil {
|
|
|
|
// Error while attempting to parse flags
|
2020-04-06 17:28:44 +00:00
|
|
|
return finalCmd, completions, ShellCompDirectiveDefault, err
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-04-10 19:56:28 +00:00
|
|
|
if flag == nil {
|
|
|
|
// Complete subcommand names
|
|
|
|
for _, subCmd := range finalCmd.Commands() {
|
|
|
|
if subCmd.IsAvailableCommand() && strings.HasPrefix(subCmd.Name(), toComplete) {
|
|
|
|
completions = append(completions, fmt.Sprintf("%s\t%s", subCmd.Name(), subCmd.Short))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(finalCmd.ValidArgs) > 0 {
|
|
|
|
// Always complete ValidArgs, even if we are completing a subcommand name.
|
|
|
|
// This is for commands that have both subcommands and ValidArgs.
|
|
|
|
for _, validArg := range finalCmd.ValidArgs {
|
|
|
|
if strings.HasPrefix(validArg, toComplete) {
|
|
|
|
completions = append(completions, validArg)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// If there are ValidArgs specified (even if they don't match), we stop completion.
|
|
|
|
// Only one of ValidArgs or ValidArgsFunction can be used for a single command.
|
|
|
|
return finalCmd, completions, ShellCompDirectiveNoFileComp, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Always let the logic continue so as to add any ValidArgsFunction completions,
|
|
|
|
// even if we already found sub-commands.
|
|
|
|
// This is for commands that have subcommands but also specify a ValidArgsFunction.
|
|
|
|
}
|
|
|
|
|
2020-04-03 19:43:43 +00:00
|
|
|
// Parse the flags and extract the arguments to prepare for calling the completion function
|
|
|
|
if err = finalCmd.ParseFlags(finalArgs); err != nil {
|
2020-04-06 17:28:44 +00:00
|
|
|
return finalCmd, completions, ShellCompDirectiveDefault, fmt.Errorf("Error while parsing flags from args %v: %s", finalArgs, err.Error())
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// We only remove the flags from the arguments if DisableFlagParsing is not set.
|
|
|
|
// This is important for commands which have requested to do their own flag completion.
|
|
|
|
if !finalCmd.DisableFlagParsing {
|
|
|
|
finalArgs = finalCmd.Flags().Args()
|
|
|
|
}
|
|
|
|
|
|
|
|
// Find the completion function for the flag or command
|
2020-04-06 17:28:44 +00:00
|
|
|
var completionFn func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)
|
2020-04-03 19:43:43 +00:00
|
|
|
if flag != nil {
|
|
|
|
completionFn = flagCompletionFunctions[flag]
|
|
|
|
} else {
|
|
|
|
completionFn = finalCmd.ValidArgsFunction
|
|
|
|
}
|
|
|
|
if completionFn == nil {
|
|
|
|
// Go custom completion not supported/needed for this flag or command
|
2020-04-06 17:28:44 +00:00
|
|
|
return finalCmd, completions, ShellCompDirectiveDefault, nil
|
2020-04-03 19:43:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Call the registered completion function to get the completions
|
|
|
|
comps, directive := completionFn(finalCmd, finalArgs, toComplete)
|
|
|
|
completions = append(completions, comps...)
|
|
|
|
return finalCmd, completions, directive, nil
|
|
|
|
}
|
|
|
|
|
2020-04-10 19:56:28 +00:00
|
|
|
func getFlagNameCompletions(flag *pflag.Flag, toComplete string) []string {
|
|
|
|
if nonCompletableFlag(flag) {
|
|
|
|
return []string{}
|
|
|
|
}
|
|
|
|
|
|
|
|
var completions []string
|
|
|
|
flagName := "--" + flag.Name
|
|
|
|
if strings.HasPrefix(flagName, toComplete) {
|
|
|
|
// Flag without the =
|
|
|
|
completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
|
|
|
|
|
|
|
|
if len(flag.NoOptDefVal) == 0 {
|
|
|
|
// Flag requires a value, so it can be suffixed with =
|
|
|
|
flagName += "="
|
|
|
|
completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
flagName = "-" + flag.Shorthand
|
|
|
|
if len(flag.Shorthand) > 0 && strings.HasPrefix(flagName, toComplete) {
|
|
|
|
completions = append(completions, fmt.Sprintf("%s\t%s", flagName, flag.Usage))
|
|
|
|
}
|
|
|
|
|
|
|
|
return completions
|
|
|
|
}
|
|
|
|
|
2020-04-03 19:43:43 +00:00
|
|
|
func checkIfFlagCompletion(finalCmd *Command, args []string, lastArg string) (*pflag.Flag, []string, string, error) {
|
|
|
|
var flagName string
|
|
|
|
trimmedArgs := args
|
|
|
|
flagWithEqual := false
|
|
|
|
if isFlagArg(lastArg) {
|
|
|
|
if index := strings.Index(lastArg, "="); index >= 0 {
|
|
|
|
flagName = strings.TrimLeft(lastArg[:index], "-")
|
|
|
|
lastArg = lastArg[index+1:]
|
|
|
|
flagWithEqual = true
|
|
|
|
} else {
|
|
|
|
return nil, nil, "", errors.New("Unexpected completion request for flag")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(flagName) == 0 {
|
|
|
|
if len(args) > 0 {
|
|
|
|
prevArg := args[len(args)-1]
|
|
|
|
if isFlagArg(prevArg) {
|
|
|
|
// Only consider the case where the flag does not contain an =.
|
|
|
|
// If the flag contains an = it means it has already been fully processed,
|
|
|
|
// so we don't need to deal with it here.
|
|
|
|
if index := strings.Index(prevArg, "="); index < 0 {
|
|
|
|
flagName = strings.TrimLeft(prevArg, "-")
|
|
|
|
|
|
|
|
// Remove the uncompleted flag or else there could be an error created
|
|
|
|
// for an invalid value for that flag
|
|
|
|
trimmedArgs = args[:len(args)-1]
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(flagName) == 0 {
|
|
|
|
// Not doing flag completion
|
|
|
|
return nil, trimmedArgs, lastArg, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
flag := findFlag(finalCmd, flagName)
|
|
|
|
if flag == nil {
|
|
|
|
// Flag not supported by this command, nothing to complete
|
|
|
|
err := fmt.Errorf("Subcommand '%s' does not support flag '%s'", finalCmd.Name(), flagName)
|
|
|
|
return nil, nil, "", err
|
|
|
|
}
|
|
|
|
|
|
|
|
if !flagWithEqual {
|
|
|
|
if len(flag.NoOptDefVal) != 0 {
|
|
|
|
// We had assumed dealing with a two-word flag but the flag is a boolean flag.
|
|
|
|
// In that case, there is no value following it, so we are not really doing flag completion.
|
|
|
|
// Reset everything to do noun completion.
|
|
|
|
trimmedArgs = args
|
|
|
|
flag = nil
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return flag, trimmedArgs, lastArg, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func findFlag(cmd *Command, name string) *pflag.Flag {
|
|
|
|
flagSet := cmd.Flags()
|
|
|
|
if len(name) == 1 {
|
|
|
|
// First convert the short flag into a long flag
|
|
|
|
// as the cmd.Flag() search only accepts long flags
|
|
|
|
if short := flagSet.ShorthandLookup(name); short != nil {
|
|
|
|
name = short.Name
|
|
|
|
} else {
|
|
|
|
set := cmd.InheritedFlags()
|
|
|
|
if short = set.ShorthandLookup(name); short != nil {
|
|
|
|
name = short.Name
|
|
|
|
} else {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return cmd.Flag(name)
|
|
|
|
}
|
|
|
|
|
|
|
|
// CompDebug prints the specified string to the same file as where the
|
|
|
|
// completion script prints its logs.
|
|
|
|
// Note that completion printouts should never be on stdout as they would
|
|
|
|
// be wrongly interpreted as actual completion choices by the completion script.
|
|
|
|
func CompDebug(msg string, printToStdErr bool) {
|
|
|
|
msg = fmt.Sprintf("[Debug] %s", msg)
|
|
|
|
|
|
|
|
// Such logs are only printed when the user has set the environment
|
|
|
|
// variable BASH_COMP_DEBUG_FILE to the path of some file to be used.
|
|
|
|
if path := os.Getenv("BASH_COMP_DEBUG_FILE"); path != "" {
|
|
|
|
f, err := os.OpenFile(path,
|
|
|
|
os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
|
|
|
|
if err == nil {
|
|
|
|
defer f.Close()
|
|
|
|
f.WriteString(msg)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if printToStdErr {
|
|
|
|
// Must print to stderr for this not to be read by the completion script.
|
|
|
|
fmt.Fprintf(os.Stderr, msg)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// CompDebugln prints the specified string with a newline at the end
|
|
|
|
// to the same file as where the completion script prints its logs.
|
|
|
|
// Such logs are only printed when the user has set the environment
|
|
|
|
// variable BASH_COMP_DEBUG_FILE to the path of some file to be used.
|
|
|
|
func CompDebugln(msg string, printToStdErr bool) {
|
|
|
|
CompDebug(fmt.Sprintf("%s\n", msg), printToStdErr)
|
|
|
|
}
|
|
|
|
|
|
|
|
// CompError prints the specified completion message to stderr.
|
|
|
|
func CompError(msg string) {
|
|
|
|
msg = fmt.Sprintf("[Error] %s", msg)
|
|
|
|
CompDebug(msg, true)
|
|
|
|
}
|
|
|
|
|
|
|
|
// CompErrorln prints the specified completion message to stderr with a newline at the end.
|
|
|
|
func CompErrorln(msg string) {
|
|
|
|
CompError(fmt.Sprintf("%s\n", msg))
|
|
|
|
}
|